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	<head>
		<title>three.js webgl - materials - environment maps</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
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	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl environment mapping example<br/>
			Equirectangular Map by <a href="http://www.flickr.com/photos/jonragnarsson/2294472375/" target="_blank" rel="noopener">J&oacute;n Ragnarsson</a>.
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

			let controls, camera, scene, renderer;
			let textureEquirec, textureCube;
			let sphereMesh, sphereMaterial, params;

			init();

			function init() {

				// CAMERAS

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( 0, 0, 2.5 );

				// SCENE

				scene = new THREE.Scene();

				// Textures

				const loader = new THREE.CubeTextureLoader();
				loader.setPath( 'textures/cube/Bridge2/' );

				textureCube = loader.load( [ 'posx.jpg', 'negx.jpg', 'posy.jpg', 'negy.jpg', 'posz.jpg', 'negz.jpg' ] );

				const textureLoader = new THREE.TextureLoader();

				textureEquirec = textureLoader.load( 'textures/2294472375_24a3b8ef46_o.jpg' );
				textureEquirec.mapping = THREE.EquirectangularReflectionMapping;
				textureEquirec.colorSpace = THREE.SRGBColorSpace;

				scene.background = textureCube;

				//

				const geometry = new THREE.IcosahedronGeometry( 1, 15 );
				sphereMaterial = new THREE.MeshBasicMaterial( { envMap: textureCube } );
				sphereMesh = new THREE.Mesh( geometry, sphereMaterial );
				scene.add( sphereMesh );

				//

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				document.body.appendChild( renderer.domElement );

				//

				controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 1.5;
				controls.maxDistance = 6;

				//

				params = {
					Cube: function () {

						scene.background = textureCube;

						sphereMaterial.envMap = textureCube;
						sphereMaterial.needsUpdate = true;

					},
					Equirectangular: function () {

						scene.background = textureEquirec;

						sphereMaterial.envMap = textureEquirec;
						sphereMaterial.needsUpdate = true;

					},
					Refraction: false,
					backgroundRotationX: false,
					backgroundRotationY: false,
					backgroundRotationZ: false,
					syncMaterial: false
				};

				const gui = new GUI( { width: 300 } );
				gui.add( params, 'Cube' );
				gui.add( params, 'Equirectangular' );
				gui.add( params, 'Refraction' ).onChange( function ( value ) {

					if ( value ) {

						textureEquirec.mapping = THREE.EquirectangularRefractionMapping;
						textureCube.mapping = THREE.CubeRefractionMapping;

					} else {

						textureEquirec.mapping = THREE.EquirectangularReflectionMapping;
						textureCube.mapping = THREE.CubeReflectionMapping;

					}

					sphereMaterial.needsUpdate = true;

				} );
				gui.add( params, 'backgroundRotationX' );
				gui.add( params, 'backgroundRotationY' );
				gui.add( params, 'backgroundRotationZ' );
				gui.add( params, 'syncMaterial' );
				gui.open();

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			//

			function animate() {

				if ( params.backgroundRotationX ) {

					scene.backgroundRotation.x += 0.001;

				}

				if ( params.backgroundRotationY ) {

					scene.backgroundRotation.y += 0.001;

				}

				if ( params.backgroundRotationZ ) {

					scene.backgroundRotation.z += 0.001;

				}

				if ( params.syncMaterial ) {

					sphereMesh.material.envMapRotation.copy( scene.backgroundRotation );

				}

				camera.lookAt( scene.position );
				renderer.render( scene, camera );

			}

		</script>

	</body>
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